Electric-light fixture



Patented Feb. 22, 192k.

2 HETS'v-HEET l.

B. B. STENVALI..

ELECTRIC LIGHT FIXTURE.

APPLICATloN FILED Nov. 7, 1919.

B. B. STINVALL.`

ELECTRIC LIGHT FIXTURE.

2 SHEETS-SHEET 2- IQ In BRUNOB. STENVALL, OF BROOKLYN, NEW YORK.

ELECTRIC-LIGHT FIXTURE.

Specification of Letters Patent.

Patented Feb.l 22, 1921.

Application filed November 7, 1919. Serial No. 336,291.

To all whom t may concern Be it known that I, BRUNO B. STENVALL, a citizen of the United States, and a vresident of the cityy of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Electric-Light Fixture, of which the following is a description. l a My invention relates to an electric light fixture of the type generally employed on a desk, a workbench, or the like.

The invention has for its objects to provide a iiXture of the indicated class improved and distinctive in various respects as will appear from the specific description hereinafter given, important features residing in novel means for variously adjusting the light, novel supporting means therefor, a novel manner of arranging the conductor cord with respect to the adjustable and 'supporting elements, and in the provision of an arm carrying the light and attachable to supporting means, the attaching member of the armconstituting a handle when the arm is detached from its supporting means, whereby the light, may be employed as an effective and convenient searchlight for searching for example about or beneath a workbench or in the drawers thereof.

Y Reference is to be had to the accompanying Idrawings formingv a part of this specification, it being understood that the drawings are merely illustrative of one. example of the invention.

Figure 1 is a plan View of an electric light xture embodying my invention;

Fig. 2 is a side elevation thereof with parts of the supporting standard broken away and others in section; Fig. 3 is a longitudinal vertical section taken in a plane corresponding with the line 3-3 of Fig. `1, the lower portion ofthev Fig. 8 is a view similar to Fig. 6 but showing a slightly'diiferent arrangement of the spring means for producing friction at the hinge joints, the view being taken on the line 8 8, Fig. 9;

Fig. 9 is a fragmentary side view of the parts shown inFig. 8; A j

Fig. 10 is a side elevation of the lamp and its arm with a slightly different form of support for said arm;

Fig. 11 is an enlarged transverse vertical section on the line 11 of Fig. 10;

Fig. 12 is a side elevation of the supportedv lamp and lamp arm with still another form of support, the latter shown partly in` section;

Fig. .13 is an enlarged detail in vertical section given to show the inlet for the conductor cord.

My improved fixture includes as an important element a supporting arm for the electric 'lamp A, said arm in practice being made in vsections hinged together and designated respectively 10, 11, 12 and 13, the

section 12 being of short tube and the sec-` tion 13 at its outer end being hinged to the lamp socket 14. 'The pivots of the arm members are designated generally by the numeral 15. The conductor cord 16 in my invention leads laterally into the lamp supporting arm, there being provided for the sev purpose preferably in the inner or attach-` ing member 10 of said arm an inlet presented by an insulatingbushing 17 tapped into said member 10 advantageously at the under side thereof. 4

For producing friction at the hinge joints 15 spring means is provided, uwhich in the form illustrated in Figs. 1, 2, 6, 7 10 and 12 consists of elongated plate springs 18 extending from one joint to another, the ends being secured by the pivots 15 as best seen in Figs. 6 and 7 there being separate pivots 15 at each side. Each of saidv pivots includes a screw bolt 15a having a head 15b at the inside of the joint and receiving a nut l5c at the outside of the joint, said bolt passing outwardly through side tongue members 1,5%forined on the ends of the adj aceiit mem- 'bers 10, 11, 12 and 13 and on the back ofthe socketv 14, the bolts passing also through springs 18 which are disposed outside of the overlapped members 19, a washer being employed/between the nut 15 and the adjacent spring 1,8. In the'form shownin Figs. 8 and 9 instead of elongated friction springs of the fixed portion of the column an -18 associated with two adjacent joints, separate springs 18a are employed at each joint,

said springs being secured at one end by the bolts 15a outside of the overlapped tongues 19 and inside the washers 20, the opposite ends of said springs being fastened in any suitable manner as by screws 21.

JThesupporting means for the described Sectional lamp supporting arm in the form of the invention shown in Figs. 1, 2, 3 and 5, includes an upstanding support designated generally by the numeral 22 and comprising a tubular standard 23 having a suitable base or flange 23a that may be fastened by screws or the like to a desk top, a workbench, or the like. At the upper end of the standard 23 is. a fixed transverse tubular guide' 24 which receives extensible elements here shown as outer and inner telescoping tubes 25, 26. The outer tube 25 is snugly slidable in the guide 24 andthe inner tube 26 is slidable in the tube 25 and is adapted to receive at its front .end the attaching member 10 of the lamp supporting arm as hereinafter further referred to. The rearward movement of the tube 25 in guide 24 is limited by any suitable means such as a pin 27 on the front end of said tube, adapted to enter a notch 28 in the adjacent end of the guide 24, while the movement of said tube 25 forwardlyv is limited in -the form shown by a depending pin 29 thereon adapted to enter a longitudinal slot 30 in the under .side of guide 24 at the rear, the forward end of said slot serving to arrest the pin 29. In Fig. 1 0, I have shown the telescoping members 25, 26 on a lowsupport designated generally by the character 22a and comprising a tubular guide 24a corresponding substantially with the guide 24. The guide 24a has a depending boss 241b received in ,a socket 23b formed on a base 23c adapted to be secured by screws '23d or the 'like to a desk, the construction being particularly suitable for securing the fixture to the top of a roll-top desk. In Fig.

12, the attaching member 10`is held in a support designated generally by the character 22b and comprising an upstanding socket 23b A on any approved portable base 23c so that the complete fixture may be shifted about a\ desk or bench as desired.

The upper portion 23r of the tubular standard 23 is swiveled to turn about the axis of said standard, forwhich purpose in the illustrated form, said upper portion is formed with. a lower terminal 23g of reduced diameter to fit within the adjacent upper end d to rest on the latter by a shoulder 23h presented at the base of the terminal 23g. Thus, the upper p ortion 23f is free to turn with the fixed guide 24 thereon, the telescoping members 25, 26 and the lamp-carrying arm and lamp to sw1ng the lamp horizontally through any desired arc or through a complete circle,

ying means is employed which in the preferred. form of the invention comprises a .latch projection 29 in the form of a thin plate-like element on an elongated spring 30 disposed within the member 26, the spring tending to throw said latchoutward through a slot 31 in member 26 and into a corresponding slot 32 in the attaching member 10 when the said member 10 is in place on the member 26 and the slots are in register as indicated injFig. 3. The spring 30 is removably held in the telescoping member 26 by the resiliency of the spring which at its forward end is curved as at 33 into frictional engagement withthe inner surface ofthe member 26 preferably at the bottom, while the inner end curves in the opposite direction as at 34 to frictionally engage the inner surface of the member 26 diametrically opposite the engageinent by the end 33, there being a bearing stud 35 on said spring adjacent to the v end 34 to make the resiliency of the spring effective in frictionally engaging the member 26. rllhe spring 30 with its latch projection 29 and stud 35 may be removed from the member 26 by pressing the latch 29 inwardly into said member and grasping the end 33 of the spring by forceps or the like. I provide also within the member 26 a second latch means to lock the telescoping members 25, 26 in the extended position of the latter member, said latch means comprising a spring 36 corresponding generally with the spring 30 and inserted in the member 26 at the rear end. A latch projection 37 on'the spring 36 is adapted to be projected by the resiliency of the spring'through hole 38 in member 26 and through a hole 39 in the member 25 adjacent to the front end of the latter, see Figs. 3 and 4, when said holes are in register as when the member 26 is fully extended as in Fig. 5. Also, on the spring 36 adjacent to the latch-projection 37 is a projection 40 adapted to be projected by the resiliency of the spring through a hole 41 in the member 26 when the latch 37 is in engagement with the member 25, said projection 40 being adapted to be pressed against by a finger to flex the spring 36 inwardly for releasing the latch 37 fromdmember 25 t0 permit telescoping of the members. The ends of the spring 36 are curved as at 33",

ends 33, 34, of spring 30 to frictionally engage the member 26 at diametrically opposite j points at the interior thereof, the spring being adapted to be withdrawn as described inf'lconnection with the spring 30. The spring 36 `is provided with al bearing member 35a4 (Fig. 4) corresponding in function with the bearing member 35 to give effectiveness 'to' the resiliency of the spring in frictionally l by the lamp can be quickly detached from its support and used as a searchlight about a workbench or desk. The entering of the conductor cord 16 forward of the rearend of the lamp-carrying arm contributesto the practicability of employing the lamp as a searchlight since convenience is thus promoted in that the conductor cord is more readily prevented from catching on any ob' jects on a workbench for example while the lamp is being moved about.

In the preferred form of the invention illustrated in Figs. 1, 2 and 3, the maximum, adjustments are made possible, the swiveled upper end 23i of the supporting standard permitting the lamp to be swung laterally with said standard as a center; the horizontal guide 24 with the Sliding members 25, 26 therein permittingl longitudinal movement of the supporting arm of the lamp transversely of the supporting element; the telescoping character of the members 25, 26 affording a wide range of extensibility; and the hinge joints 15 providing for vertical adjustment of the lamp as well as varying the general angular position of the lamp, relatively to a vertical line, by reason of the outer pivot 15; said adjustments being ady. ditional to the capability of throwing the light beam in any desired direction laterally by turning the usual reector about the axis of the lamp socket. ln addition to the stated advantages of adjustment, the detachability of the handle member 10 permits -of its being -separated from the member 26 and placed on other supports such as those shown at 22a, 22".y Thus the detachable searchlight organism as an entity distinct from the fixed supportive structuve, marks an important advance over the use-bodily of vthe usual portable fixtures'as searchlights,

besides the adaptability of the portable search-light to supports of different kinds whereby the portable searchlight may enter into fixed desk and bench lights of various forms as described.

I would state in conclusion that while the illustrated lexample constitutes a practical embodiment of my invention, l do not limit myself strictly to the mechanicall details herein illustrated, since manifestly the same can be considerably varied without depar- .ture from the spirit of the .invention as de fined in the appended claim.

Having thus described my invention, I claim: A.

As a new article of manufacture, an electric light fixture including a support, a

swiveled member mountedv to turn in said'v support about a vertlcal ax-1s, a transversely.

disposed tubular member rigid on`L said swiveled member and open at both'ends, a second tubular member disposed longitudinally in said rigid member' and slidable thereinvto project more or less from either end of the rigid member, sto means to limit a movement of said slida le member in either direction, a member telescoping in said tubular member, means for adjustably securing said telesc'oping member to said slidable member, and means to4 support Ia, lamp from said telescoping member.

BRUNO B.. STENVALL.

Witness JERONIM POMERANETZ. 

